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(B) Infrared radiation was discovered in $1800$ by William Herschel.He discovered it when sunlight passed through various color filters,producing diff

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William Herschel

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(B) Infrared radiation was discovered in $1800$ by William Herschel.He discovered it when sunlight passed through various color filters,producing different amounts of heat. He hypothesized that colors could have different temperatures. He then passed light through a glass prism,creating a color spectrum and analyzing each color's temperature using three special thermometers.For each color,one thermometer was placed within its bounds while the other two were outside as controls. The thermometer in the color had a higher temperature than the others,and he found that each color going from violet to red was warmer than the last. He then placed a thermometer next to the red light,where no color from the spectrum was visible. He noticed that this area had an even higher temperature than the colored sections. He demonstrated that this invisible type of light refracted and reflected the same way sunlight did. This light came to be known as infrared radiation.

List-$I$	List-$II$
$A$. Microwaves	$I$. Radioactive decay of the nucleus
$B$. Gamma rays	$II$. Rapid acceleration and deceleration of electrons in aerials
$C$. Radio waves	$III$. Inner shell electrons
$D$. $X$-rays	$IV$. Klystron valve

Infrared radiation was discovered in $1800$ by

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